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Character Warnings
[^] Code Examples
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<<Input Statistics Builtin Types>>
Watch out for:

char inch
while((inch = getchar()) != EOF)
      Infinite loop on some systems.

char ch = 'p'
tolower(ch)
      Older implementations break if you run tolower on a character which is not actually an upper case letter. Likewise with toupper.
<<Input Statistics Builtin Types>>